nice question
tho the answer may depend on what you mean by country
as well as what you mean by smallest
& also what you mean by border
believe it or not
but monaco at about 4400 meters has the smallest border of any country in the united nations
tho the vatican city
which is also often considered a country
has an even smaller one at about 3200 meters
& the best answer is probably to just give you your choice of these 2
but there are smaller borders
which however are shared by countries that have other borders too
& thus cant be the one country nor provide the one border you appear to be seeking
still
it may be fitting to mention that the shortest known land frontier of any kind is shared by morocco & Spain at a place on the coast of North Africa called penon de velez de la gomera
& it is so small that it may practically disappear at high tide in a storm tho it is normally about 100 meters long
&
a fixed boundary segment between Bangladesh & India with an unvarying length of about 30 meters surrounds the smallest enclave in the world
which is named upan chowki bhaini
&
a very possibly shorter frontier may also exist in Africa at the confluence of the zambezi & chobe rivers where 4 countries converge so closely together that it is not even possible to say with certainty which 2 of them share the resulting miniborder
most people consider that it must belong to botswana & Zambia because these 2 countries are joined by a ferry & observe normal border formalities at the ferry terminals
yet the best available maps indicate that the 2 countries which really adjoin in this location are not botswana & Zambia at all but rather namibia & Zimbabwe
but in either case this frontier is quite possibly the smallest border in the world also
The country with the smallest border is Monaco, which has a land border of just 4.4 kilometers (2.7 miles) with France.
The smallest bordering country of Russia is Lithuania, with a border length of 227 kilometers.
The smallest country in Africa is Seychelles.
The smallest country in the world, Vatican City, is located in Europe.
No, Haiti is not the smallest country in the world. It is the third largest country in the Caribbean by land area. The smallest country in the world is Vatican City.
The smallest country in the Greater Antilles is Jamaica.
Bhutan
Monaco has the smallest border with France, 3.4 miles long (5.5 kilometers). Monaco is a city-state, the second smallest city in Europe, and its only neighbour is France.
it is the smallest German speaking country. it is completely land locked. only German speaking country that doesn't share a border with Germany.
Kuwait, Bahrain, and Qatar are the smallest countries that border the Persian Gulf and Bahrain is the smallest.
Monaco, a city-state located on the Mediteranean sea, has France as its only neighbour. The border is under 5.5 kilometres long. Monaco is the second-smallest state in the world, after the Vatican.
The State of Kuwait is the smallest country that is bordered by both Saudi Arabia and Iraq. Kuwait shares its southern border with Saudi Arabia and northern border with Iraq.
it is the smallest German speaking country. it is completely land locked. only German speaking country that doesn't share a border with Germany.
That would be Monaco, which is also the second smallest country in Europe.
Vatican city is the smallest country in Europe and the smallest country in the world.
Italy, as the Vatican City is the smallest country.
The smallest country is Vatican City located in Europe.
Maldives is the 7th smallest country.